Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/20516#discussion_r167156814 --- Diff: core/src/test/scala/org/apache/spark/SparkFunSuite.scala --- @@ -59,6 +59,7 @@ abstract class SparkFunSuite protected val enableAutoThreadAudit = true protected override def beforeAll(): Unit = { + System.setProperty("spark.testing", "true") --- End diff -- Sorry let me make the question more clear. Why we need this if `./project/SparkBuild.scala:795: javaOptions in Test += "-Dspark.testing=1"` works?
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